YubiKey vs Thetis Pro-A: Which One to Choose in 2026
The Thetis Pro-A is the cheapest alternative to YubiKey with NFC support. It costs between 15 and 20€ compared to 55€ for the YubiKey 5 NFC — and for basic use with FIDO2 it does exactly the same thing. The difference lies in additional protocols: if you only need to protect accounts with passkeys or FIDO2 second factor, the Thetis is sufficient. If you need OTP, PIV or OpenPGP, only YubiKey supports them.
Quick comparison — YubiKey 5 NFC vs Thetis Pro-A
| Feature | YubiKey 5 NFC | Thetis Pro-A |
|---|---|---|
| Manufacturer | Yubico (Sweden) | Thetis (USA) |
| FIDO2 / WebAuthn | ✅ | ✅ |
| NFC | ✅ | ✅ |
| USB-A | ✅ | ✅ |
| USB-C | ✅ 5C NFC Model | ❌ |
| OTP / TOTP / HOTP | ✅ | ❌ |
| PIV / OpenPGP | ✅ | ❌ |
| Updatable Firmware | ❌ | ❌ |
| Wallet Accessories | ✅ Holdtag | ❌ |
| Approx. Price | From 55€ | From 15€ |
YubiKey or Thetis Pro-A: which is better for you?
YubiKey — more protocols
OTP, PIV, OpenPGP, TOTP — essential for developers, enterprises and advanced users.
Separate models for each connector. The 5C NFC covers Mac, iPad Pro and modern laptops without an adapter.
Compatible with more services, password managers and enterprise systems than any other key.
Holdtag trays are specifically designed for YubiKey — carry it in your wallet without adding bulk.
Thetis Pro-A — cheaper
Between 15 and 20€. For users who only need FIDO2, it's the most economical option with NFC included.
Protects Gmail, GitHub, Coinbase and any service compatible with physical security keys.
No USB-C version. On Mac or modern laptops you'll need an adapter or hub.
Does not support advanced protocols. If you need PIV or SSH with a physical key in the future, you'll have to replace it.
- You only need to protect accounts with FIDO2 and have a tight budget → Thetis Pro-A
- You use Mac or a laptop with USB-C without an adapter → YubiKey 5C NFC
- You need OTP, PIV or enterprise integration → YubiKey 5 NFC
- You want to carry it in your wallet with a wallet accessory → YubiKey + Holdtag
Where to get them
Most versatile
YubiKey 5 NFC
FIDO2, OTP, PIV, OpenPGP and NFC. The most complete on the market for personal and professional use.
Most economical
Thetis Pro-A
FIDO2 and NFC at a reduced price. Good option for users who only need basic second factor.
Frequently asked questions about YubiKey vs Thetis Pro-A
Is the Thetis Pro-A as secure as the YubiKey?
For FIDO2, yes. Both are certified physical security keys that protect equally well against phishing and account theft. The difference is not in FIDO2 security but in the additional protocols that YubiKey supports and Thetis does not.
Can I use the Thetis Pro-A with iPhone?
Yes, via NFC. Hold the key to the back of the iPhone when the service requests it. It works on iOS 13.3 or later — just like the YubiKey NFC.
Does the Thetis Pro-A work with Mac or USB-C laptop?
Only with an adapter. The Thetis Pro-A only has a USB-A connector. If you use a modern Mac or a laptop without a USB-A port, you'll need a hub or adapter — or just get the YubiKey 5C NFC.
Are Holdtag cases and trays compatible with the Thetis Pro-A?
No. Holdtag accessories are specifically designed for YubiKey 5 NFC, YubiKey 5C NFC, Security Key NFC and Security Key C NFC. The Thetis Pro-A form factor is different and doesn't fit the wallet trays.
Is it worth paying more for the YubiKey?
It depends on your use case. If you only need to protect Gmail, GitHub or Coinbase with FIDO2, the Thetis Pro-A does exactly the same at a third of the price. If you need OTP for services that don't support FIDO2, SSH with a physical key or enterprise integration, the price difference is justified.
Can I use a Thetis as a backup for my YubiKey?
Yes. On services that use FIDO2, you can register both keys on the same account. The Thetis as a backup is an economical option — although if you ever need YubiKey's advanced protocols, the backup won't work for those uses.
Thetis if price matters, YubiKey if you need more than FIDO2
For basic personal use — protecting Gmail, social media, exchanges and password managers — the Thetis Pro-A does the same as YubiKey at a third of the price. It's an honest option for those on a tight budget.
The YubiKey justifies its price in two cases: you need advanced protocols (OTP, PIV, OpenPGP) or you want a wallet accessory to carry it always with you. For that second case, Holdtag trays are only compatible with YubiKey.
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